Shapespear Exercise Sliding Discs - Dual Sided Gliding Discs for Versatile Glute Core and Ab Training - Build a Better Booty Easy to use and easy to integrate into any workout (Pilates, HIIT, Yoga, Weight Training) At only 7 inches Shapespears can travel with you anywhere for a great workout no matter where you are. Low impact, intense workout. Your feet/hands never leave the floor. Use the PVC side for carpet and the foam side for hard floors. Demonstration videos available with purchase.